Blogs

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A blog is a website maintained by one or more people who publish brief postings that appear in reverse chronological order. Readers are often able to leave comments on the individual posts.

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Blogs in Plain English

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Blog-building tools

Edublogs
Blogging for teachers and students
21Classes
David Warlick's Class Blogmeister
Blogger
Wordpress

Examples of library blogs

Blogging Libraries Wiki A lovely list of libraries that blog.
A Listing of Blogs from Illinois School Libraries
Paris High School Library, Paris, Illinois
Northfield Mount Hermon School Library, Mount Hermon, Massachusetts
Gargoyles Loose in the Library, University Laboratory High School Library, Urbana, Illinois

Microblogging

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Twitter in Plain English

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Microblogging enables users to send and read others' brief updates (generally no more than 140 text characters) within a circle of chosen contacts.

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Microblogging tools

Twitter
Tumblr

Libraries that use microblogging

Urbana Free Library on Twitter
Undergraduate Library at Illinois on Twitter
Twitter4Teachers / Librarians - a wiki with a list of links of school librarians using Twitter